Extensions to Espruino for WS2812 modules

right to left works too for a ring ;-)

function rotateRight() {
      array.unshift(array.pop()); 
      array.unshift(array.pop());
      array.unshift(array.pop());
}

you mean using a matrix NxM and rotate the hole lines horizontal or vertical like scrolling in a loop ?

Here are two new things for you Rotating Neopixel with trailer effect
and Adafruit Neopixel ringlight for close-up photography
- what do you think ?